From: Dave Airlie airlied@redhat.com
This should work for PCIE3.0 as well.
Signed-off-by: Dave Airlie airlied@redhat.com --- drivers/gpu/drm/drm_pci.c | 49 +++++++++++++++++++++++++++++++++++++++++++++ include/drm/drmP.h | 5 ++++ 2 files changed, 54 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c index 13f3d93..5320364 100644 --- a/drivers/gpu/drm/drm_pci.c +++ b/drivers/gpu/drm/drm_pci.c @@ -465,3 +465,52 @@ void drm_pci_exit(struct drm_driver *driver, struct pci_driver *pdriver) DRM_INFO("Module unloaded\n"); } EXPORT_SYMBOL(drm_pci_exit); + +int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask) +{ + struct pci_dev *root; + int pos; + u32 lnkcap, lnkcap2; + + *mask = 0; + if (!dev->pdev) + return -EINVAL; + + if (!pci_is_pcie(dev->pdev)) + return -EINVAL; + + root = dev->pdev->bus->self; + + pos = pci_pcie_cap(root); + if (!pos) + return -EINVAL; + + /* we've been informed via and serverworks don't make the cut */ + if (root->vendor == PCI_VENDOR_ID_VIA || + root->vendor == PCI_VENDOR_ID_SERVERWORKS) + return -EINVAL; + + pci_read_config_dword(root, pos + PCI_EXP_LNKCAP, &lnkcap); + pci_read_config_dword(root, pos + PCI_EXP_LNKCAP2, &lnkcap2); + + lnkcap &= PCI_EXP_LNKCAP_SLS; + lnkcap2 &= 0xfe; + + if (lnkcap2) { /* PCIE GEN 3.0 */ + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB) + *mask |= DRM_PCIE_SPEED_25; + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB) + *mask |= DRM_PCIE_SPEED_50; + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) + *mask |= DRM_PCIE_SPEED_80; + } else { + if (lnkcap & 1) + *mask |= DRM_PCIE_SPEED_25; + if (lnkcap & 2) + *mask |= DRM_PCIE_SPEED_50; + } + + DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", root->vendor, root->device, lnkcap, lnkcap2); + return 0; +} +EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask); diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 31ad880..e4e3be3 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1761,6 +1761,11 @@ extern int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, struct drm_driver *driver);
+#define DRM_PCIE_SPEED_25 1 +#define DRM_PCIE_SPEED_50 2 +#define DRM_PCIE_SPEED_80 4 + +extern int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *speed_mask);
/* platform section */ extern int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device);